<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
	<title>dense_vector(密集矢量)数据类型 | ElasticSearch 7.7 权威指南中文版</title>
	<meta name="keywords" content="ElasticSearch 权威指南中文版, elasticsearch 7, es7, 实时数据分析，实时数据检索" />
    <meta name="description" content="ElasticSearch 权威指南中文版, elasticsearch 7, es7, 实时数据分析，实时数据检索" />
    <!-- Give IE8 a fighting chance -->
    <!--[if lt IE 9]>
    <script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
    <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
	<link rel="stylesheet" type="text/css" href="../static/styles.css" />
	<script>
	var _link = 'dense-vector.html';
    </script>
</head>
<body>
<div class="main-container">
    <section id="content">
        <div class="content-wrapper">
            <section id="guide" lang="zh_cn">
                <div class="container">
                    <div class="row">
                        <div class="col-xs-12 col-sm-8 col-md-8 guide-section">
                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/dense-vector.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/dense-vector.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/dense-vector.html" rel="nofollow" target="_blank">../en/dense-vector.html</a></div>
                        <!-- start body -->
                  <div class="page_header">
<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
</div>
<div id="content">
<div class="breadcrumbs">
<span class="breadcrumb-link"><a href="index.html">Elasticsearch 权威指南 [7.7]</a></span>
»
<span class="breadcrumb-link"><a href="mapping.html">映射</a></span>
»
<span class="breadcrumb-link"><a href="mapping-types.html">字段数据类型</a></span>
»
<span class="breadcrumb-node">dense_vector(密集矢量)数据类型</span>
</div>
<div class="navheader">
<span class="prev">
<a href="date_nanos.html">« date_nanos(日期纳秒)数据类型</a>
</span>
<span class="next">
<a href="histogram.html">histogram(直方图)数据类型 »</a>
</span>
</div>
<div class="section xpack">
<div class="titlepage"><div><div>
<h2 class="title">
<a id="dense-vector"></a>dense_vector(密集矢量)数据类型
</h2>
</div></div></div>

<p>
<code class="literal">dense_vector</code>类型的字段存储浮点值的密集向量。

向量中的最大维数不应超过2048。

<code class="literal">dense_vector</code>类型的字段是一个单值字段。
</p>
<p>
这些向量可用于<a class="xref" href="query-dsl-script-score-query.html#vector-functions" title="用于vector字段的函数">文档评分</a>。

例如，文档得分可以表示给定查询向量和索引文档向量之间的距离。
</p>
<p>将密集向量索引为一个浮点数组。</p>
<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT /my_index
{
  "mappings": {
    "properties": {
      "my_vector": {
        "type": "dense_vector",
        "dims": 3  <a id="CO294-1"></a><i class="conum" data-value="1"></i>
      },
      "my_text" : {
        "type" : "keyword"
      }
    }
  }
}

PUT my_index/_doc/1
{
  "my_text" : "text1",
  "my_vector" : [0.5, 10, 6]
}

PUT my_index/_doc/2
{
  "my_text" : "text2",
  "my_vector" : [-0.5, 10, 10]
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/626.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO294-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>dims - 向量的维数，必需的参数。</p>
</td>
</tr>
</table>
</div>
<p>
在内部，每个文档的密集向量被编码为一个二进制的文档值。

它的字节大小等于<code class="literal">4 * dims + 4</code>，其中<code class="literal">dims</code>是向量的维数。
</p>
</div>
<div class="navfooter">
<span class="prev">
<a href="date_nanos.html">« date_nanos(日期纳秒)数据类型</a>
</span>
<span class="next">
<a href="histogram.html">histogram(直方图)数据类型 »</a>
</span>
</div>
</div>

                  <!-- end body -->
                        </div>
                        <div class="col-xs-12 col-sm-4 col-md-4" id="right_col">
                        
                        </div>
                    </div>
                </div>
            </section>
        </div>
    </section>
</div>
<script src="../static/cn.js"></script>
</body>
</html>